Efficient Doping of Carbon Nanotube Sheet for Optimization of Dopants
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Harvesting waste heat generated from the human body to provide self-powering function to wearable devices has attracted much attention. However, the lack of practically applicable p- and n-type thermoelectric materials has hindered the implementation of thermoelectric generators. In this study, we show a dopant material showing effective p- and n-type thermoelectric performances by doping carbon nanotube sheets (CNTSs). The CNTSs used in this study show that the mechanical robustness and flexibility are significantly improved when attached to a polymer substrate by using a screen-printing process. In addition, it was shown that doping using drop casting method is advantageous in achieving stable p- and n-type performance. This study demonstrates that CNTSs have promising potential as thermoelectric materials and provide an opportunity to effectively produce flexible and robust thermoelectric energy harvesters.